GTX 770 vs R9 280 X?

which one is better for gaming ? 

and will it benefit my build ?

and also do i have to overclock my CPU to get a real performance gain ?

 

this is my build 

http://azerty.nl/winkelmandje/winkelmandje/?legen=1&product%5B528532%5D=1&product%5B563039%5D=1&product%5B455750%5D=1&product%5B563658%5D=1&product%5B447319%5D=1&product%5B398419%5D=1

 

the games i most of the time play are rome 2 total war , battelfield 4 and civilization 5 

 

Dude.

280x=7970=770

You consider an upgrade to these cards from a 7950...as I sad in the other topic, it's not worth it.

i would personaly go with FX8350 or FX8320 Asus M5A99FX pro R2.0 motherboard. and a R9-280X. because BF at mantle can utilize  more cores.

i dont see where hes got a 7950, if he allready has a 7950 with an overclock it can come close a a 7970 and even beats a GTX770 in some games, so in therms of that its not worth it then. ☺then its better to stay with the 7950 safe you some money and trow a GTX780 or amd R9-290 (X) in it later on.